The treaty, which must still be ratified in the U.S. Senate and in Russia, would replace a 19-year-old pact that called for both countries to draw down their dangerous arsenals of thousands of long-range nuclear weapons.

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The treaty calls for both sides to reduce the stockpiles of their most dangerous weapons — those already deployed and ready to launch at long-range targets — by about 30 percent, allowing each side to retain about 1,550 such warheads.

It also limits deployed and non-deployed missile launchers and heavy bombers to 800, and says that each side may only have 700 such equipment already deployed — a cut in half from the limits in the previous treaty.

The treaty will need 67 Senate votes, including Republican support. Will they still be the party of “no”?